Why are the bulbs in figure B, C and D are not lighting up?

Why are the bulbs in Figures B, C and D not lighting up?

In the figure below A,B and C are three types of

Answer the following question: A student connected two bulbs in two different combinations as shown in figure. A and B. Observe the figure and answer the following questions: In which combination will the bulbs be brighter?

Answer the following question: A student connected two bulbs in two different combinations as shown in figure. A and B. Observe the figure and answer the following questions: Name the type of combination of the bulbs in figure B.

Answer the following question: A student connected two bulbs in two different combinations as shown in figure. A and B. Observe the figure and answer the following questions: Name the type of combination of the bulbs in figure A.

Answer the following question: A student connected two bulbs in two different combinations as shown in figure. A and B. Observe the figure and answer the following questions: Name the law applied for the two combinations.

Answer the following question: A student connected two bulbs in two different combinations as shown in figure. A and B. Observe the figure and answer the following questions: State the combination in which the resistance will be decreased.

In the figure below A , B and C are three types of _______

Take the inside tray of a used up match box and place a small magnetic needle inside the tray . Now take a long connecting wire and wind it around the tray . Complete the electric circuit ny connecting in it , this wire , electric cell , plug key and a bulb as shown in the below figure .: Mark the position of the magnetic needle . take a bar magnet near to the magnetic needle . keep looking at the needle and close the plug key . the bulb will light up , and you will realize that the current has started flowing . does the magnetic needle change its position ? :